Bill Cooper's 350 700R4 Conversion-
I'm slowly working through a Classic RR to Chevy TPI conversion using a 700r4 transmission. My truck is an '89 Classic. I have the adapter and the special output shaft machined to mate the trans to the Borg Warner transfer case. More adapters are available. Clearance between transmission case and pan to the front output yoke is problematic but manageable with light mods. Motor mounts use an aftermarket tubular crossmember with 70's Corvette mounts. This is to allow clearance for block hugger headers on left side, impossible with the original frame mounts, now removed. Power steering pump is a GM front wheel drive with serpentine belt relocated to clear steering box.
I can provide photos of progress to date. I have several extra output shafts and can also get additional trans adapters CNC machined from my file if there is interest.